Draft Details

Designation:C745
Source:CSA
Review start date:Dec 4, 2019
Review end date:Feb 2, 2020
Categories:Energy
Contact email:mary.morgan(at)csagroup.org
Draft Scope/Description:

SCOPE

1.1
This Standard specifies the methods for determining the uniform energy factor for electric storage tank water heaters and heat pump water heaters.

1.2
This Standard establishes minimum energy efficiency levels for electric storage tank water heaters and heat pump water heaters.

1.3
This Standard applies to
a) electric storage tank water heaters
i) with volumes of 7.6 to 454 L (2 to 120 US gal);
ii) having electric heater elements with power inputs ≤ 12 kW; and
iii) designed to heat and store water at a thermostatically controlled temperature equal to or less than 82 ºC (180ºF); and
b) heat pump water heaters that have
i) a maximum current rating of ≤ 24 A; (including the compressor and all  auxiliary equipment such as fans, pumps, controls, and, if on the same circuit, any resistive elements
ii) A maximum wattage rating ≤ 15kW
iii) a single-phase maximum voltage of ≤ 250 V; and
iv) with volumes of 7.6 to 454 L (2 to 120 US gal);
     v) rated storage volume ≤ 454 L (120 US gal);   

1.4
This Standard does not apply to high-temperature water heaters.

1.5
The tests contained in this Standard are not intended to represent actual efficiencies realized in the field. Instead, these tests provide a standardized method of comparing performance. 

1.6
This Standard is written in SI units. The values given in parentheses are for information only. The SI values have been calculated from the US Customary Units measurements found in the US Department of Energy publication 10 CFR, Part 430, appendix E, subpart

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